As the catalogue explains, Diebenkorn
forged strong allegiances to sources in American art and popular culture before fully responding to Matisse's influence; the teacher who introduced him to Sarah Stein was in fact a disciple of Edward Hopper, and it was the example of Hopper's hard - won, vernacular images that guided Diebenkorn's early engagement with the harsh literalism of the American scene, which was often hostile to modernism.